Complete API reference for window.Magic.* in SuperMagic HTML micro-apps (HTML 微应用). Read this skill when you need exact method signatures, parameters, return types, or usage examples for: fs (readFile/writeFile/listFiles/listDir/getFileUrl/deleteFile/deleteDir/moveFile/renameFile/watchFile/watchDir), llm (chat/stream/getModels), agent (getAgents/selectAgent), project (createTopicAndSend/sendMessage/uploadFiles/downloadFiles), user (getInfo with app.json userInfo scopes), getAppBasePath, setInputMessage, reload. Also covers file-per-record data storage, list projection file names, tiptap JSON message format, @file and @skill mention structures, model selector UI rules, user info authorization, error handling patterns, and backward compatibility table. Trigger phrases: 'window.Magic API', 'readFile writeFile', 'listDir watchDir', 'getFileUrl', 'get file url', '文件 URL', '获取文件链接', 'deleteFile deleteDir', 'moveFile renameFile', 'watchFile callback', 'watchDir callback', 'llm.stream', 'llm.chat', 'createTopicAndSend format', 'tiptap JSON mention', '@file mention structure', '@skill mention', 'getAppBasePath usage', 'model selector UI', 'user.getInfo', 'get user info', 'user avatar', 'userInfo scopes', 'app.json permissions', 'Magic API 用法', 'fs 读写文件 API', 'fs 获取文件链接', 'fs 删除文件', 'fs 移动重命名', '目录监听', '文件监听回调', '话题消息格式', 'mention 结构', '模型选择器', '用户信息', '用户授权', '获取头像'.